# Command Reference

## Menu Items

A brief overview of some special menu items in &kcalc;:

Constants Mathematics

  Display Pi, Euler Number or Golden Ratio.

Constants Electromagnetism

  Display Light Speed, Elementary Charge, Impedance of Vacuum, Permeability of Vacuum or Permittivity of Vacuum.

Constants Atomic & Nuclear

  Display Planck's Constant, Elementary Charge or Fine-Structure Constant.

Constants Thermodynamics

  Display Boltzmann Constant, Atomic Mass Unit, Molar Gas Constant, Stefan-Boltzmann Constant or Avogadro's Number.

Constants Gravitation

  Display Constant of Gravitation or Earth Acceleration.

Settings Simple Mode

  Displays the simple math buttons.

Settings Science Mode

  Displays trigonometric and science buttons.

Settings Statistic Mode

  Displays statistic buttons.

Settings Numeral System Mode

  Displays logic buttons and allows changing the numeral system.

Settings Show History

  Display the history.

Settings Constants Buttons

  Display constants buttons. They are available in science mode and statistic mode.

Settings Show Bit Edit

  Displays a bit edit field. Click on a bit to toggle it. Only available in numeral system mode.

Additionally &kcalc; has the common File, Edit, Settings and Help menu items, for more information read the sections about the Menus in the &kde; Fundamentals.